RefuseFascism.org, the anti-Trump organization that has been active since the election, has smeared Ben Shapiro as a “white supremacist” and “fascist thug” ahead of the right-wing pundit’s speech at U.C. Berkeley scheduled for later this month.

“Fascist thug & white supremacist Ben Shapiro is coming to UC Berkeley - The issue is not ‘Free Speech.’ The Issue is Fascism,” wrote the organization in a Saturday Facebook post. The post called to block Shapiro’s speech, declaring, “campuses must become fascist-free zones.”

Shapiro, editor of The Daily Wire, is an Orthodox Jew who has frequently denounced white supremacists and other members of the so-called “alt-right.” According to studies from the Anti-Defamation League, Shapiro received the most anti-Semitic harassment on Twitter during last year’s campaign season.

He has faced raucous protest from left-wing groups during prior appearances on other university campuses.